Metal-forming fixture



March 12, 1929.

R. P. HECKMAN METAL FORMING FIXTURE Filed 00%. 18, 1926 Patented Mar.12, 1929.

UNITED STATES PATENT OFFICE.

RICHARD P. HECKMAN, OF CHICAGO, ILLINOIS, ASSIGNOR T0 WATSON HURLBURT,OF CHICAGO, ILLINOIS.

METAL-FORMING FIXTURE.

Application filed October 18, 1926.

The invention relates to a construction where parts of the objects to beacted upon necessarily occupy a position directly beneath the punch, andunderneath the matrix, during the operation of forming other parts ofsaid object.

The objects of my invention are:

First :To get a clear space beneath the matrix of a width and heightpredetermined by the length and diameter of the object to receive theimpression, parts of which may curve around and beneath when placed inposition on the matrix preparatory to receiving its indentation.

Second :To construct a fixture for rapid operation and reduce productioncosts.

Third :--A fixture that can be installed and operated in either a footor power press. I attain these objects by means of the various parts asillustrated in the accompanying drawings, in which Fig. 1 is aperspective view of the complete fixture, a hand being shown holding anobject under the punch preparatory to being acted upon. The other hand(usually both hands are used) being left off to avoid obstructing thepicture.

Fig. 2 is a cross section on line 22 of Fig. 1, showing the punch ashaving descended upon the work and forming the hook. The object indotted lines under the punch illustrates the fact that objects ofdifferent diameters may be conveniently operated upon.

Fig. 3 illustrates a completed sleeve, hooks being formed on one end,reversing and formin the other end.

Simifiar numerals refer to similar parts throughout the several views.

Number 1 illustrates the bed plate of a common form of foot press, inwhich 2 is a side piece, the other being spaced away and not here shown.Between these two the long lever 3 swings on the fulcrum pin 4, theextension 5 of lever 3 actuates the sliding head 6 carryin the punch 7through the medium of the ho der 8 and set screw 9. Matrix 10 has in itthe V slot 11. The punch positioned relative to the object 13 in Fig. 2and by having its working edge conform in a reverse manner to the V inthe matrix forces the metal into the V causing it to take the form shownin Fig. 3 at 12. As this operation occurs the object is caused to swingabout the point of the punch as its axis, finally resting in theposition shown by 13 in Fig. 2. The hands Serial No. 142,507.

must hold the object so loosely that it quite easily assumes thisposition, else if held too firmly a deformation will occur in theuniformity of the curve, which is detrimental to the general appearance.An object of large diameter is subject to the same unfavorable resultsas the inertia of the piece itself is enhanced by the average greaterdistance of its parts from the axis of swing, but can be overcome byslowing up of the operation.

In placing the object in position on the matrix 10, it is forced againstthe stop 15 held against movement by screw 16, thus limiting the lengthof the hooks l2. Matrix 10 is supported by uprights 17 in Fig. 1 and itscompanion 17 shown in Fig. 2, being fastened to these by screws 18 anddowels 19. Uprights l7 and 1T may have extensions at the base taking theform of an ordinary die shoe and be held in position by bolts 20 andnuts 21 working in slots in the extensions and slots 23, a common formof construction in the base of the press. Uprights 17 and 17 may be mademore rigid by the spanner 24 cast integral with the uprights.

1. claim:

1. The combination in a metal forming fixture, of a bed plate, a matrix,spaced away from the bed plate, a punch Which is the reverse of thematrix, end pieces to retain the matrix in spaced relation to the bedplate, and having lateral lugs, bolts securing the lugs to the bedplate, and a limiting stop.

2. The combination in a metal forming fixture of a bed plate, a matrix,spaced away from the bed plate, a punch which is the reverse of thematrix, and pieces upstanding from the bed plate. and attached to thematrix, and having lugs for holding down purposes, bolts attaching thelugs to the bed plate, a spanner upstanding from the bed plate,supporting the matrix, and a limiting stop.

3. The combination in a metal forming fixture, of a bed plate, a matrixplate the major portion of which is at one side of the center line ofthe punch and spaced away from the bed plate, a punch fitting thematrix, end pieces upstanding from the bed plate with means forattachment to the bed plate, and maintaining said matrix in spacedrelation to the bed plate, means attaching the end pieces to the bedplate, a spanner upstanding from the bed plate attached to the endpieces, and supporting the matrix plate, and a limitin stop.

4. In a mac ine for crimping the margins of curved sheet metal forms, incombination,

5 a supporting member, a matrix, a punch for cooperating with saidmatrix, means for supporting said matrix in spaced relation to saidsupporting member and for providing a clearance directly beneath saidpunch for accommodating the free ends of said curved forms, and alimiting stop for positioning the form on the matrix.

RICHARD P. HECKMAN.

